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Publication numberUS4310864 A
Publication typeGrant
Application numberUS 06/045,484
Publication dateJan 12, 1982
Filing dateJun 4, 1979
Priority dateJun 4, 1979
Also published asCA1128203A1
Publication number045484, 06045484, US 4310864 A, US 4310864A, US-A-4310864, US4310864 A, US4310864A
InventorsDilip C. Patel, John D. Stricklin, Bruno Koehne
Original AssigneeMagnetic Peripherals Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cartridge loading and unloading mechanism
US 4310864 A
Abstract
An improvement to allow easier detaching of a disk memory module from its magnetic attachment to the spindle of a front loading disk drive. In one such type of drive, manually pulling a door open actuates a track-mounted carrier which lifts the disk module from the spindle, breaking the magnetic attraction between them, and transporting the module to the open door for manual removal. To reduce the force necessary to break the magnetic attraction, this invention employs an actuator fixed to the carrier which engages a crank mechanism when the carrier is being pulled to the opening. The crank mechanism pushes against the underside of the module and assists its breaking loose from the spindle. A spring holds the crank assembly in position to re-engage the actuator when the carrier is in the module-detached position.
Images(3)
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Claims(6)
We claim:
1. In a disk memory drive of the type having a deck on which a rotatable drive spindle is accessible for magnetic coupling thereto of the disk hub contained in a replaceable disk module, a carrier frame, tracks mounting the carrier frame slidingly on the deck, said carrier frame supporting the module and slidingly conveying it between a position enabling the spindle to hub coupling and a position adjacent a module removal port, said tracks having ramp sections for lifting the carrier frame-supported module and detaching its hub from the spindle during movement of the carrier frame from the spindle to the port, and wherein said tracks and carrier frame incorporate a predetermined amount of free travel between the position of the carrier frame enabling the spindle to hub coupling and the onset of traversal of the tracks' ramp sections, an improvement for reducing the force needed for shifting the carrier frame along the tracks to break the disk hub from the spindle coupling, comprising:
(a) a lift mechanism mounted on the deck and at least partially between the deck and the module surface facing the deck and including a first lever moveable from a first position to a second position, a second lever, and a linkage portion connecting the first lever to the second lever, said second lever moved by force transmitted by the linkage portion from the first lever, from a first position exerting no substantial force on the disk hub and corresponding to the first lever's first position, to a second position exerting force on the disk hub directed axially away from the spindle and corresponding to a position of the first lever between its first and second positions; and
(b) an actuator mounted on the carrier frame and engaging the first lever and moving it from its first to its second position when the carrier moves from its extreme spindle to hub coupling position to ramp section traversal, whereby the forces on the disk hub created by the second lever's and the carrier's movement combine to detach the hub from the spindle.
2. The improvement of claim 1 wherein the lift mechanism comprises a deck-journaled shaft carrying the first and second levers.
3. The improvement of claim 2, wherein the first lever includes a projection extending approximately parallel to the shaft's axis of rotation, and wherein the actuator includes a slot engaging the projection at an open end as the carrier frame moves towards its spindle to hub coupling position and shifting the first lever from its second to its first position, as the carrier frame reaches the spindle to hub coupling position.
4. The improvement of claim 3, further including means for biasing the first lever toward its second position.
5. The improvement of claim 3, wherein the second lever is oriented relative the first lever so as to press against the module housing, when the first lever is between its first and second positions.
6. The improvement of claim 5, further adapted for breaking from the spindle a disk hub contained in a module housing having a resiliently deflectable area of its surface facing the deck, wherein the second lever is positioned so as to press against the deflectable area of the housing.
Description
BACKGROUND OF THE INVENTION

One type of disk memory drive now coming into popularity employs a loading port for the associated memory module on a vertical face of the drive. Such a drive is described in U.S. Patent Application Ser. No. 949845 filed Oct. 10, 1978 by Loren Skarky, and having a common assignee with this application. Those portions of the Skarky application describing and showing the spindle, the cartridge and the magnetic coupling between them are hereby incorporated by reference into this application. This port has a hinge-mounted cover or door which is connected by a linkage to a module carrier within the drive. The purpose of the module carrier is to transport the module from its position with the disk hub magnetically mounted on the drive's spindle, to a position allowing manual removal of the module through the port, and also to permit loading of a module by the reversal of these operations. The magnetic coupling between the disk hub and the spindle is relatively strong, a substantial amount of force being required to break it. In the original design, the carrier is track-mounted, said track having a ramp section for lifting the carrier and the module carried by it up from the spindle and causing the hub to break away from the spindle, when the door is being opened. The relatively high forces involved cause excessive wear and fatigue on the linkage, tracks, and module to carrier attachment.

DESCRIPTION OF THE PRIOR ART

The closest art of which we are aware is described in U.S. Pat. No. 3,899,794, which uses a system of slotted tracks to lift and transport the module. The magnetic force holding the module hub to the drive spindle is broken by a compound mechanical advantage of a lever actuated by the initial motion of opening the drive's door. U.S. Pat. Nos. 3,593,327 and 3,800,325 show a simple lever extension of the door sealing the opening through which the modules are inserted and removed, to break the module from the spindle. Other patents, involving top loading drives, disclose pivoting of the module handle to provide the force needed to break the magnetic attraction between the hub and the spindle.

SUMMARY OF THE INVENTION

To overcome the strong magnetic attraction between the spindle and the disk hub, we have invented a linkage actuated by the carrier, which cooperatively with the carrier applies additional force to urge the module housing away from the spindle. It is easy to provide for a certain amount of free movement of the carrier before the ramp portions of the track which break and lift the module from the spindle are reached. During this free movement, the carrier movement torsionally deflects portions of the linkage and preloads the resilient plastic housing of the module thereby supplying a substantial portion of the force needed to break the hub from the spindle.

Accordingly, one object of this invention is to reduce the maximum force needed to detach such a carrier-supported module from the magnetic coupling to the spindle.

Another purpose is to reduce wear on the various elements of the drive and module.

Yet another purpose is to reduce shock loadings on the module during the moment of breakaway from the spindle.

Other purposes and aims of this invention will be evident from the description which follows.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective sketch of a typical drive unit incorporating the invention with the module in it mounted on the spindle.

FIG. 2 is a similar perspective sketch at the point where the module has either just broken free of the spindle or, if the module is being newly mounted, just approaching the spindle to be magnetically grasped thereby.

FIG. 3 is a sketch similar to that in FIGS. 1 and 2, with the module available for removal from the drive unit.

FIGS. 4 and 5 show the breakaway assistance linkage in perspective and unobscured by any part of the drive unit.

DESCRIPTION OF THE PREFERRED EMBODIMENT

In FIG. 1, a front loading disk drive of the type described in the previously mentioned Skarky application is shown with a module 23 mounted within it. Module 23 has inwardly projecting pins 24 set in the vertical walls of channel 28. The opposing vertical wall of channel 28 also carries similar opposing pins, not shown. Pins 24 rest within slots 5 in rails 14, thereby supporting the entire module. Rails 14 in turn are permanently attached to the underside of carrier frame 13. In fact, when module 23 is mounted on the drive spindle, rails 14 support only the housing of module 23, its internal recording disks and hub (not shown) being magnetically supported by the drive spindle. When module 23 is so mounted, the position of the housing of module 23 with respect to its internal disks and hub is arranged so that clearance exists to prevent rubbing as the disks and hub spin.

An operator desiring to remove module 23 from the drive unit grasps door 12 and pulls it downwards with a counter-clockwise rotation on bracket 11 and a similar bracket, not shown, on the opposite end of door 11, shifting door 12 from its closed position in FIG. 1 blocking a module removal port in front panel 21, through the partially open position shown in FIG. 2 to the completely open position shown in FIG. 3. Link 10 and a similar unshown link connect bracket 11 and the unshown bracket to carrier 13, and cause carrier frame 13 to translate both upwardly and to the left, detaching the disk hub from the spindle and shifting module 23 adjacent to the port in front panel 21. The operator can then remove module 23 by pulling it out of the port, pins 24 sliding in slots 5. Translation of carrier 13 is guided and supported by rollers 9 and 20 which are supported on members mounted on base or deck 1, and which roll in slot type tracks 8 and 19. Similar unshown rollers and slot type tracks guide and support the opposing side of carrier 13.

As explained in the Skarky application, the disk hub is preferably clamped to the spindle by permanent magnets, and centered thereon by a centering mechanism. These magnets are relatively high flux items, so as to prevent any possibility of accidental detaching or shifting between the hub and the spindle. The great attractive force requires a relatively large force to break the hub away from the spindle when carrier 13 is transporting module 23 to the port in panel 21 for removal. This large force causes more wear than desirable on slots 5, pins 24, and tracks 8 and 19. The high breakaway force requires relatively high peak opening force for door 12. When breakaway occurs, natural resilience in the members causes a relatively high momentary shock load on module 23. For all these reasons, apparatus for simply and reliably increasing breakaway force on module 23 is advantageous.

Our preferred solution to this problem is incorporated in the apparatus, shown detached from the disk drive in which it is employed in FIGS. 4 and 5. The apparatus itself comprises a shaft 16 having a pair of levers or cranks 4 and 18 rigidly mounted at opposite ends thereof, and having first and second positions, shown respectively in FIG. 1 and FIG. 4 (dashed outline 18a), and in FIG. 3. Shaft 16 is journaled in pillow blocks 15 and 22, said pillow blocks themselves being supported by deck 1 of the drive unit. Crank 4 is located beneath the housing of module 23 and carries on it roller 3 which will, when crank 18 is rotated to approximately its vertical position, contact the lower surface of module 23. Crank 18 carries at its upper end pin 17 projecting outwardly and parallel to shaft 16. Crank 18 also projects transversely past the connection point to shaft 16 to form an extension near the end of which is fastened one end of spring 6. Spring 6 is dead-ended at deck strap 25. An actuator 7 is permanently attached to carrier 13, positioned where its path intersects the path of pin 17 as crank 18 rotates.

In operation, when door 12 is pulled open bracket 11 pivots and link 10 begins to pull carrier 13 towards the port for door 12. Carrier 13 shifts actuator 7 in the direction of the arrow shown adjacent it in FIGS. 2 and 4. Pin 17 is initially confined in slot 26. Motion of actuator 27 causes pin 17 to slide in slot 26 causing arm 18 to pivot from its first position and rotate shaft 16. As shaft 16 rotates, crank 4 also rotates causing roller 3 to lift and press against the underside of module 23 while crank 4 is between its first and second positions. Further shifting of carrier 13 closer to the port in panel 21 causes additional lifting force to be placed on the underside of module 23 both by carrier 13 acting through pins 24, and by roller 3 being pressed against the bottom of module 23 by the movement of actuator 7 causing the rotation of shaft 16. Because of the straigthline profile of tracks 8 and 19 adjacent rollers 9 and 20 in FIG. 1 carrier 13 undergoes only straightline motion as an operator begins to open door 12. This motion allows crank 4 to swing part-way up from its first position to a position intermediate its first and second positions, and begin pressing roller 3 against module 23. When the ramp portions of slots 8 and 19 encounter rollers 9 and 20 respectively, additional force is generated to break module 23 away from its magnetic attachment to the disk drive spindle. The combination of the force from roller 3 and the force generated by the ramp portions of slots 8 and 19 are sufficient to easily and gently detach module 23. Preferably, the angle between cranks 4 and 18 is selected to cause breakaway while they are between their first and second positions. Because of flexibility in the bottom of module 23 and resiliencies throughout the linkage these two sources of breakaway force cooperate to provide the total amount of force needed.

As carrier 13 is shifted to the port for door 12, pin 17 will eventually slide out of slot 26 when carrier 13 has advanced slightly past the position in FIGS. 2 and 5 toward that of FIG. 3. Spring 6 is located to bias crank lever 18 toward a second position so that when door 12 is being reclosed and carrier 13 is moving away from panel 21, projection 27 on actuator 7 strikes pin 17 causing it to slide along the leftmost surface of slot 26 and eventually return to the first position shown in FIG. 1, and by dashed outline crank lever 18a in FIG. 4. Use of the spring 6 to maintain the second position of crank lever 18 when door 12 is completely opened is simply one of several ways to gain the correct re-engagement orientation of crank lever 18. A detent or pendulum arrangement will work equally well.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3416150 *Aug 2, 1965Dec 10, 1968Data Disc IncMagnetic recording disc cartridge
US3593327 *Oct 24, 1968Jul 13, 1971Singer CoMemory-disc cartridge with loading mechanism
US3662360 *Jun 23, 1970May 9, 1972Digital Information Storage CoMagnetic information disk equipment
US3899794 *Nov 30, 1973Aug 12, 1975Wangco IncFront loading disc drive apparatus
US4040106 *Jun 4, 1976Aug 2, 1977Shugart Associates, Inc.Flexible magnetic disc drive apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4527264 *Jun 8, 1984Jul 2, 1985Staar S.A.Compact disc loading and unloading device with rotationally actuated movable disc support
US4532564 *Sep 16, 1981Jul 30, 1985Dysan CorporationRemovable disk cartridge
US4562498 *Dec 1, 1983Dec 31, 1985Tokyo Shibaura Denki Kabushiki KaishaLoading/ejecting device for a magnetic disk
US4656542 *May 23, 1984Apr 7, 1987Kabushiki Kaisha ToshibaDevice for loading and ejecting a floppy disk into and from a magnetic disk drive
US4658944 *Apr 22, 1985Apr 21, 1987Seiko Seiki Kabushiki KaishaDisc clutch mechanism for a magnetic disc apparatus of cartridge type
US4683506 *Aug 4, 1983Jul 28, 1987Syquest TechnologyDisc drive arrangement for a hard disc cartridge with a read/write head retract mechanism
US4700247 *Jan 4, 1985Oct 13, 1987Kabushiki Kaisha ToshibaLoading/ejecting apparatus for floppy disc
US4722012 *May 5, 1987Jan 26, 1988Syquest TechnologyDisc drive arrangement for a hard disc cartridge having a carriage for accurately positioning a head relative to the cartridge
US5091898 *Jun 14, 1988Feb 25, 1992Pioneer Electronic CorporationPlayback/recording apparatus having a device for positively preventing entire cartridge from springing out of slot
US6072666 *May 30, 1997Jun 6, 2000Iomega CorporationHead retraction system for retracting the heads of a disk drive
US6359756Nov 19, 1999Mar 19, 2002Iomega CorporationDisk drive having a system for protecting the read/write heads
US7495712 *Jul 2, 2005Feb 24, 2009Funai Electric Co., Ltd.Television with a disk playback feature and disk playback apparatus
DE3332322A1 *Sep 7, 1983Apr 5, 1984Magnetic Peripherals IncKassetten-lademechanismus
DE3644284A1 *Dec 23, 1986Jun 25, 1987Gold Star CoTape-cassette loading mechanism for a cassette video-tape machine
DE3820801A1 *Jun 20, 1988Feb 16, 1989Pioneer Electronic CorpReproducing/recording apparatus for a recording carrier in disc form accommodated in a cassette
EP0427531A2 *Nov 7, 1990May 15, 1991Mitsubishi Denki Kabushiki KaishaDisk cartridge loading/unloading system
WO1998054714A1 *Apr 29, 1998Dec 3, 1998Iomega CorpAn improved head retraction system for retracting the heads of a disk drive
Classifications
U.S. Classification360/99.06, 360/86, G9B/17.01, 360/99.12, 360/133, 720/630
International ClassificationG11B17/032
Cooperative ClassificationG11B17/032
European ClassificationG11B17/032
Legal Events
DateCodeEventDescription
May 10, 1993ASAssignment
Owner name: SEAGATE TECHNOLOGY, INC., CALIFORNIA
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANKAMERICA;REEL/FRAME:006518/0887
Effective date: 19930128
Feb 8, 1993ASAssignment
Owner name: SEAGATE TECHNOLOGY, INC., CALIFORNIA
Free format text: MERGER;ASSIGNOR:MAGNETIC PHERIPHERALS INC.;REEL/FRAME:006486/0237
Effective date: 19900531
Oct 2, 1989ASAssignment
Owner name: SECURITY PACIFIC NATIONAL BANK, AS AGENT, NEW YORK
Free format text: SECURITY INTEREST;ASSIGNOR:MAGNETIC PERIPHERALS, INC.;REEL/FRAME:005184/0213
Effective date: 19890929
Aug 19, 1983ASAssignment
Owner name: MAGNETIC PERIPHERALS INC.
Free format text: CHANGE OF NAME;ASSIGNOR:NEW MPI, INC.;REEL/FRAME:004186/0823
Effective date: 19830726
Owner name: NEW MPI, INC., 8100 34TH AVE. SO., MINNEAPOLIS, MN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MAGNETIC PERIPHERALS INC.;REEL/FRAME:004186/0827
Effective date: 19830408